considering a different project directory struture

inspired by freebsd source tree

Makefile

@@ -8,29 +8,18 @@
 # permitted in any medium without royalty provided the copyright notice and this
 # notice are preserved.  This file is offered as-is, without any warranty.
 
-.POSIX:
+#.POSIX:
 
-# if using BSD make(1), remove these pragmas because they break it
+include config.mk
-.PRAGMA: posix_202x # future POSIX standard support à la pdpmake(1)
-.PRAGMA: command_comment # breaks without this?
-
-DESTDIR ?= dist
-PREFIX ?= /usr/local
-
-SYSEXITS != printf '\043include <sysexits.h>\n' | cpp -M - | sed 's/ /\n/g' \
-	| sed -n 's/sysexits\.h//p' || printf 'include\n'
-
-CC ?= cc
-RUSTC ?= rustc
-RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
-	--extern sysexits=build/o/libsysexits.rlib \
-	--extern strerror=build/o/libstrerror.rlib
-CFLAGS += -I$(SYSEXITS)
 
 .PHONY: all
-all: dj false fop hru intcmp mm npc rpn scrut str strcmp swab true
+all: prepare
+	@$(MAKE) -C lib
+	@$(MAKE) -C bin
 
-build:
+
+.PHONY: prepare 
+prepare:
 	# keep build/include until bindgen(1) has stdin support
 	# https://github.com/rust-lang/rust-bindgen/issues/2703
 	mkdir -p build/bin build/include build/lib build/o build/test
@@ -42,100 +31,14 @@ clean:
 dist: all
 	mkdir -p $(DESTDIR)/$(PREFIX)/bin $(DESTDIR)/$(PREFIX)/share/man/man1
 	cp build/bin/* $(DESTDIR)/$(PREFIX)/bin
-	cp docs/*.1 $(DESTDIR)/$(PREFIX)/share/man/man1
+	cp bin/*/*.1 $(DESTDIR)/$(PREFIX)/share/man/man1
+
 
 .PHONY: install
 install: dist
 	cp -r $(DESTDIR)/* /
 
 .PHONY: test
-test: build
+test: prepare
 	tests/posix-compat.sh
 	$(RUSTC) --test src/getopt-rs/lib.rs -o build/test/getopt
-
-.PHONY: rustlibs
-rustlibs: build/o/libsysexits.rlib build/o/libgetopt.rlib \
-	build/o/libstrerror.rlib
-
-build/o/libgetopt.rlib: build src/getopt-rs/lib.rs
-	$(RUSTC) $(RUSTFLAGS) --crate-type=lib --crate-name=getopt \
-		-o $@ src/getopt-rs/lib.rs
-
-build/o/libstrerror.rlib: build src/strerror.rs
-	$(RUSTC) $(RUSTFLAGS) --crate-type=lib -o $@ \
-		src/strerror.rs
-
-build/o/libsysexits.rlib: build $(SYSEXITS)sysexits.h
-	# bandage solution until bindgen(1) gets stdin support
-	printf '#define EXIT_FAILURE 1\n' | cat - $(SYSEXITS)sysexits.h \
-		> build/include/sysexits.h 
-	bindgen --default-macro-constant-type signed --use-core --formatter=none \
-		build/include/sysexits.h | $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -
-
-.PHONY: dj
-dj: build/bin/dj
-build/bin/dj: src/dj.c build
-	$(CC) $(CFLAGS) -o $@ src/dj.c
-
-.PHONY: false
-false: build/bin/false
-build/bin/false: src/false.c build
-	$(CC) $(CFLAGS) -o $@ src/false.c
-
-.PHONY: fop
-fop: build/bin/fop
-build/bin/fop: src/fop.rs build rustlibs
-	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/fop.rs
-
-.PHONY: hru
-hru: build/bin/hru
-build/bin/hru: src/hru.rs build rustlibs 
-	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/hru.rs
-
-.PHONY: intcmp
-intcmp: build/bin/intcmp
-build/bin/intcmp: src/intcmp.c build
-	$(CC) $(CFLAGS) -o $@ src/intcmp.c
-
-.PHONY: mm
-mm: build/bin/mm
-build/bin/mm: src/mm.c build
-	$(CC) $(CFLAGS) -o $@ src/mm.c
-
-
-.PHONY: npc
-npc: build/bin/npc
-build/bin/npc: src/npc.c build
-	$(CC) $(CFLAGAS) -o $@ src/npc.c
-
-.PHONY: rpn
-rpn: build/bin/rpn
-build/bin/rpn: src/rpn.rs build rustlibs
-	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/rpn.rs
-
-.PHONY: scrut
-scrut: build/bin/scrut
-build/bin/scrut: src/scrut.c build
-	$(CC) $(CFLAGS) -o $@ src/scrut.c
-
-.PHONY: str
-str: build/bin/str
-build/bin/str: src/str.c build
-	$(CC) $(CFLAGS) -o $@ src/str.c
-
-.PHONY: strcmp
-strcmp: build/bin/strcmp
-build/bin/strcmp: src/strcmp.c build
-	$(CC) $(CFLAGS) -o $@ src/strcmp.c
-
-.PHONY: swab
-swab: build/bin/swab
-build/bin/swab: src/swab.rs build build/o/libsysexits.rlib
-	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
-		--extern sysexits=build/o/libsysexits.rlib \
-		-o $@ src/swab.rs
-
-.PHONY: true
-true: build/bin/true
-build/bin/true: src/true.c build
-	$(CC) $(CFLAGS) -o $@ src/true.c

bin/Makefile

@@ -0,0 +1,91 @@
+# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
+# Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
+# Copyright (c) 2024 Aaditya Aryal <aryalaadi123@gmail.com>
+# SPDX-License-Identifier: FSFAP
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+include ../config.mk
+
+.PHONY: bin
+bin: dj false fop hru intcmp mm npc rpn scrut str strcmp swab true
+
+.PHONY: lib
+
+# TODO: this does not have to be here
+.PHONY: prepare
+prepare:
+	# keep ..$(BUILD)/include until bindgen(1) has stdin support
+	# https://github.com/rust-lang/rust-bindgen/issues/2703
+	mkdir -p ../$(BUILD)/bin ../$(BUILD)/include ../$(BUILD)/lib
+	mkdir -p ../$(BUILD)/test  ../$(BUILD)/o 
+
+.PHONY: dj
+dj: ../$(BUILD)/bin/dj
+../$(BUILD)/bin/dj: dj/dj.c prepare
+	$(CC) $(CFLAGS) -o $@ dj/dj.c
+
+.PHONY: false
+false: ../$(BUILD)/bin/false
+../$(BUILD)/bin/false: false/false.c prepare
+	$(CC) $(CFLAGS) -o $@ false/false.c
+
+.PHONY: fop
+fop: ../$(BUILD)/bin/fop
+../$(BUILD)/bin/fop: fop/fop.rs prepare lib
+	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ fop/fop.rs
+
+.PHONY: hru
+hru: ../$(BUILD)/bin/hru
+../$(BUILD)/bin/hru: hru/hru.rs prepare lib 
+	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ hru/hru.rs
+
+.PHONY: intcmp
+intcmp: ../$(BUILD)/bin/intcmp
+../$(BUILD)/bin/intcmp: intcmp/intcmp.c prepare
+	$(CC) $(CFLAGS) -o $@ intcmp/intcmp.c
+
+.PHONY: mm
+mm: ../$(BUILD)/bin/mm
+../$(BUILD)/bin/mm: mm/mm.c prepare
+	$(CC) $(CFLAGS) -o $@ mm/mm.c
+
+.PHONY: npc
+npc: ../$(BUILD)/bin/npc
+../$(BUILD)/bin/npc: npc/npc.c prepare
+	$(CC) $(CFLAGAS) -o $@ npc/npc.c
+
+.PHONY: rpn
+rpn: ../$(BUILD)/bin/rpn
+../$(BUILD)/bin/rpn: rpn/rpn.rs prepare lib
+	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ rpn/rpn.rs
+
+.PHONY: scrut
+scrut: ../$(BUILD)/bin/scrut
+../$(BUILD)/bin/scrut: scrut/scrut.c prepare
+	$(CC) $(CFLAGS) -o $@ scrut/scrut.c
+
+.PHONY: str
+str: ../$(BUILD)/bin/str
+../$(BUILD)/bin/str: str/str.c prepare
+	$(CC) $(CFLAGS) -o $@ str/str.c
+
+.PHONY: strcmp
+strcmp: ../$(BUILD)/bin/strcmp
+../$(BUILD)/bin/strcmp: strcmp/strcmp.c prepare
+	$(CC) $(CFLAGS) -o $@ strcmp/strcmp.c
+
+.PHONY: swab
+swab: ../$(BUILD)/bin/swab
+../$(BUILD)/bin/swab: swab/swab.rs prepare lib
+	$(RUSTC) $(RUSTFLAGS) --extern getopt=../$(BUILD)/o/libgetopt.rlib \
+		--extern sysexits=../$(BUILD)/o/libsysexits.rlib \
+		-o $@ swab/swab.rs
+
+.PHONY: true
+true: ../$(BUILD)/bin/true
+../$(BUILD)/bin/true: true/true.c prepare
+	$(CC) $(CFLAGS) -o $@ true/true.c

config.mk

@@ -0,0 +1,29 @@
+# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
+# Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
+# Copyright (c) 2024 Aaditya Aryal <aryalaadi123@gmail.com>
+# SPDX-License-Identifier: FSFAP
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+# if using BSD make(1), remove these pragmas because they break it
+.PRAGMA: posix_202x # future POSIX standard support à la pdpmake(1)
+.PRAGMA: command_comment # breaks without this?
+
+DESTDIR ?= dist
+PREFIX ?= /usr/local
+BUILD ?= build
+
+SYSEXITS != printf '\043include <sysexits.h>\n' | cpp -M - | sed 's/ /\n/g' \
+	| sed -n 's/sysexits\.h//p' || printf 'include\n'
+
+CC ?= cc
+RUSTC ?= rustc
+RUSTLIBS = --extern getopt=../$(BUILD)/o/libgetopt.rlib \
+	--extern sysexits=../$(BUILD)/o/libsysexits.rlib \
+	--extern strerror=../$(BUILD)/o/libstrerror.rlib
+
+CFLAGs += --std=c99 -Wall -pedantic -Werror
+CFLAGS += -I$(SYSEXITS)

lib/Makefile

@@ -0,0 +1,30 @@
+# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
+# Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
+# Copyright (c) 2024 Aaditya Aryal <aryalaadi123@gmail.com>
+# SPDX-License-Identifier: FSFAP
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+include ../config.mk
+
+.PHONY: lib
+lib: ../$(BUILD)/o/libsysexits.rlib ../$(BUILD)/o/libgetopt.rlib \
+	../$(BUILD)/o/libstrerror.rlib
+
+../$(BUILD)/o/libgetopt.rlib: getopt-rs/lib.rs
+	$(RUSTC) $(RUSTFLAGS) --crate-type=lib --crate-name=getopt \
+		-o $@ getopt-rs/lib.rs
+
+../$(BUILD)/o/libstrerror.rlib: strerror.rs
+	$(RUSTC) $(RUSTFLAGS) --crate-type=lib -o $@ \
+		strerror.rs
+
+../$(BUILD)/o/libsysexits.rlib: $(SYSEXITS)sysexits.h
+	# bandage solution until bindgen(1) gets stdin support
+	printf '#define EXIT_FAILURE 1\n' | cat - $(SYSEXITS)sysexits.h \
+		> ../$(BUILD)/include/sysexits.h
+	bindgen --default-macro-constant-type signed --use-core --formatter=none \
+		../$(BUILD)/include/sysexits.h | $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -